Added jia.pb source file.
Added GPLv3 license file.
Prepared EntryPoint function.
Added Read / Execute / Write loop.
Extracted prompt functionality into procedure.
Added IsWhiteSpace() procedure.
Added 'cd' command.
Built-in commands are now stored in a map.
Arguments will now be parsed correctly.
Parameters are now handled properly.
Added methods to get and set environment variables.
Jia now executes commands specified in the command line.
Added directory for extensions.
Jia now checks the extension directory for applications.
Added 'cmd' command to execute shell commands.
Extensions that are hidden or start with a dot are excluded.
Added version information.